For many, today at sundown marks Rosh Hashanah, or, if you will, the Jewish New Year. Celeb tweeters, both those celebrating and those simply wishing a Shana Tova to those who observe, took to their pages. Nichole Richie posted the traditional, "Shana Tova!", as did Ricky Martin who wrote, "L'Shana Tova to all of my friends celebrating Rosh Hashana!!!!!"

Pink is not only celebrating Rosh Hashanah today, but her her 31st birthday as well! The star's honey Carey Hart tweeted, "And its a special day today! Its my sexy mamma's b day today!!! Letting @pink sleep in." The "So What" singer certainly appreciated the love, especially from one person in particular, as she shared, " thank you all for the birthday wishes:) we should all be congratulating my mama:) she did all the work. thanks mommy:) i love you. xoxo."